CVE-2026-25646

HIGHNVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.7% (52nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 10, 2026

Last Modified

September 1, 2026

Advisory Details (3)

Auto-updated Jun 10, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Heap buffer overflow in `png_set_quantize` · Advisory · pnggroup/libpng · GitHub

https://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3
Web page

oss-security - libpng 1.6.55: Heap buffer overflow vulnerability fixed: CVE-2026-25646

http://www.openwall.com/lists/oss-security/2026/02/09/7
GitHub commit

commit 01d03b8453eb (pnggroup/libpng)

Fix landed in pnggroup/libpng commit 01d03b8453eb — awaiting tagged release

https://github.com/pnggroup/libpng/commit/01d03b8453eb30ade759cd45c707e5a1c7277d88

Vendor Advisories for CVE-2026-25646(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhcos-417.94.202605112123-02026-05-20redhat
redhatrhcos-414.92.202605060243-02026-05-13redhat
redhatrhcos-415.92.202605060220-02026-05-13redhat
redhatrhaiis/vllm-spyre-rhel9:17782445462026-05-12redhat
redhatrhcos-412.86.202604281506-02026-05-08redhat
redhatrhcos-416.94.202604211449-02026-04-30redhat
redhatjava-17-openjdk-1:17.0.19.0.10-1.el92026-04-24redhat
redhatjava-21-openjdk-1:21.0.11.0.10-1.el92026-04-24redhat
redhatjava-1.8.0-openjdk-1:1.8.0.492.b09-1.el92026-04-24redhat
redhatjava-17-openjdk-portable2026-04-23redhat
redhatjava-11-openjdk-portable2026-04-22redhat
redhatjava-11-openjdk-1:11.0.31.0.11-1.el92026-04-22redhat
redhatrhaiis/model-opt-cuda-rhel9:17757498572026-04-17redhat
redhatrhaiis/vllm-cuda-rhel9:17756801922026-04-17redhat
redhatrhaiis/vllm-rocm-rhel9:17756802622026-04-17redhat
redhatrhcos-413.92.202604080111-02026-04-16redhat
redhatrhcos-4.19.9.6.202604080618-02026-04-16redhat
redhatrhcos-418.94.202603261158-02026-04-09redhat
redhatlibpng12-0:1.2.50-10.el7_9.12026-04-08redhat
redhatlibpng12-0:1.2.57-5.el8_8.12026-04-08redhat
redhatlibpng12-0:1.2.57-5.el8_4.12026-04-08redhat
redhatlibpng12-0:1.2.57-5.el8_2.12026-04-08redhat
redhatlibpng12-0:1.2.57-5.el8_6.12026-04-08redhat
redhatlibpng-main-1.6.56-1.hum12026-04-07redhat
redhatlibpng15-0:1.5.30-7.el8_4.12026-04-02redhat
redhatlibpng15-0:1.5.30-7.el8_8.12026-04-02redhat
redhatlibpng15-0:1.5.30-7.el8_6.12026-04-02redhat
redhatlibpng15-0:1.5.30-7.el8_2.12026-04-02redhat
redhatlibpng15-0:1.5.30-8.el8_102026-04-02redhat
redhatlibpng12-0:1.2.57-6.el8_102026-04-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
libpng—
  • every version up to 1.6.55-r0: fixed in 1.6.55-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
libpng—
  • every version up to 1.6.55-r0: fixed in 1.6.55-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
libpng—
  • every version up to 1.6.55-r0: fixed in 1.6.55-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
libpng—
  • every version up to 1.6.55-r0: fixed in 1.6.55-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
libpng—
  • every version up to 1.6.55-r0: fixed in 1.6.55-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libpng1.61.6.37-3, 1.6.37-3+deb11u1
  • every version up to 1.6.37-3+deb11u2: fixed in 1.6.37-3+deb11u2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libpng1.61.6.39-2, 1.6.39-2+deb12u1, 1.6.39-2+deb12u2
  • every version up to 1.6.39-2+deb12u3: fixed in 1.6.39-2+deb12u3
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libpng1.61.6.48-1, 1.6.48-1+deb13u1, 1.6.48-1+deb13u2
  • every version up to 1.6.48-1+deb13u3: fixed in 1.6.48-1+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libpng1.61.6.48-1 ... 1.6.54-1 (8 versions)
  • every version up to 1.6.55-1: fixed in 1.6.55-1
—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(19)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 29× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 203 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 106 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-10-12 16:19 UTCEG score recompute
  6. 2026-10-11 20:01 UTCEG score recompute
  7. 2026-10-11 17:14 UTCEG score recompute
  8. 2026-10-11 14:46 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-10-10 01:03 UTCOSV refresh
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  13. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  16. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  17. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  23. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  24. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 1.0% · 60th percentile
Show 72 more
  1. 2026-09-20 09:03 UTCOSV refresh
  2. 2026-09-18 19:27 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  3. 2026-09-16 14:07 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  6. 2026-09-12 15:01 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  7. 2026-09-11 14:52 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  9. 2026-09-08 22:00 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  13. 2026-09-02 14:11 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  14. 2026-09-01 13:53 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  15. 2026-09-01 12:24 UTCEG score recompute
  16. 2026-09-01 12:24 UTCVendor advisory
  17. 2026-09-01 04:39 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  18. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  19. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  20. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  21. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  22. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  23. 2026-08-25 13:48 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  24. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  25. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  26. 2026-08-21 12:33 UTCEG score recompute
  27. 2026-08-21 12:33 UTCVendor advisory
  28. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  29. 2026-08-19 17:03 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  30. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  31. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  32. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  33. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  34. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  35. 2026-08-14 22:42 UTCVendor advisory
  36. 2026-08-14 10:32 UTCEG score recompute
  37. 2026-08-14 10:32 UTCVendor advisory
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  39. 2026-08-13 02:51 UTCEG score recompute
  40. 2026-08-13 02:51 UTCVendor advisory
  41. 2026-08-12 13:50 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  42. 2026-08-11 13:42 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  43. 2026-08-11 13:24 UTCVendor advisory
  44. 2026-08-11 12:25 UTCEG score recompute
  45. 2026-08-11 12:25 UTCVendor advisory
  46. 2026-08-11 00:00 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  47. 2026-08-10 02:30 UTCVendor advisory
  48. 2026-08-09 15:15 UTCEG score recompute
  49. 2026-08-09 15:15 UTCVendor advisory
  50. 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  51. 2026-08-08 16:37 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  52. 2026-08-08 09:17 UTCVendor advisory
  53. 2026-08-07 22:17 UTCEG score recompute
  54. 2026-08-07 22:17 UTCVendor advisory
  55. 2026-08-06 13:46 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  56. 2026-08-06 04:04 UTCEG score recompute
  57. 2026-08-06 04:04 UTCVendor advisory
  58. 2026-08-05 19:17 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  59. 2026-08-04 15:10 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  60. 2026-08-03 10:36 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  61. 2026-08-02 20:57 UTCEG score recompute
  62. 2026-08-02 20:57 UTCVendor advisory
  63. 2026-08-02 02:26 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  64. 2026-08-01 04:16 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  65. 2026-07-30 16:27 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  66. 2026-07-30 01:30 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  67. 2026-07-28 15:36 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  68. 2026-07-26 14:54 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  69. 2026-07-26 09:38 UTCEG score recompute
  70. 2026-07-26 09:38 UTCVendor advisory
  71. 2026-07-25 14:17 UTCEPSS rescoreEPSS 1.0% · 57th percentile
  72. 2026-07-24 14:17 UTCEPSS rescoreEPSS 1.0% · 57th percentile

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-25646?
CVE-2026-25646 is a high-severity vulnerability; its CVE record was published on February 10, 2026. LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the pngsetquantize() API function. When the function is called with no histogram and the number…
When was the CVE record for CVE-2026-25646 published?
The CVE record for CVE-2026-25646 was published on February 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 1, 2026; the record at its source may have been updated since.
Is CVE-2026-25646 actively exploited?
CVE-2026-25646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-25646?
CVE-2026-25646 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-25646?
A fix for CVE-2026-25646 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-25646 are linked in the Vendor Advisories panel on this page.

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