CVE-2026-26740

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-03-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Elevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the EGifGCBToExtension overwriting an existing Graphic Control Extension block without validating its allocated size.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100

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
Severity82% × 45%
Exploitation40% × 40%
Automatability100% × 15%
EPSS PROB
1.0%
EPSS %ILE
62nd
KEV
Not listed

Published

March 18, 2026

Last Modified

July 23, 2026

Advisory Details (4)

Auto-updated Jun 30, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26740.json
redhat Patch Available

2448747 – (CVE-2026-26740) CVE-2026-26740 giflib: giflib: Denial of Service via buffer overflow in EGifGCBToExtension

https://bugzilla.redhat.com/show_bug.cgi?id=2448747
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-26740
generic🟡 PoC Available

POC/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md at main · zakkanijia/POC · GitHub

https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md

Vendor Advisories for CVE-2026-26740(19)

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

Patch Availability(18)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibgif7 (5.2.2-1ubuntu3.2) @ resolute2026-07-26ubuntu
redhatrhaiis/model-opt-cuda-rhel9:17829510512026-07-06redhat
redhatrhaiis/vllm-rocm-rhel9:17829512442026-07-06redhat
redhatrhaiis/vllm-cuda-rhel9:17829510122026-07-06redhat
redhatgiflib-0:5.1.4-3.el8_8.22026-06-30redhat
redhatgiflib-0:5.2.1-9.el9_4.22026-06-30redhat
redhatgiflib-0:5.1.4-3.el8_4.22026-06-30redhat
redhatgiflib-0:5.2.1-9.el9_6.22026-06-30redhat
redhatgiflib-0:5.2.1-10.el9_8.22026-06-30redhat
redhatgiflib-0:5.2.1-9.el9_2.22026-06-30redhat
redhatgiflib-0:5.2.1-22.el10_0.22026-06-30redhat
redhatgiflib-0:5.1.4-5.el8_102026-06-30redhat
redhatgiflib-0:5.2.1-25.el10_22026-06-30redhat
redhatgiflib-0:5.1.4-3.el8_6.22026-06-30redhat
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-1:17.0.19.0.10-1.el92026-04-24redhat
redhatjava-25-openjdk-1:25.0.3.0.9-1.el92026-04-22redhat

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

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
giflib—
  • every version up to 5.2.2-r2: fixed in 5.2.2-r2
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
giflib—
  • every version up to 5.2.2-r2: fixed in 5.2.2-r2
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
giflib—
  • every version up to 5.2.2-r2: fixed in 5.2.2-r2
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
giflib—
  • every version up to 5.2.2-r2: fixed in 5.2.2-r2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
giflib5.1.9-2
  • every version up to 5.1.9-2+deb11u1: fixed in 5.1.9-2+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
giflib5.2.1-2.5
  • every version up to 5.2.1-2.5+deb12u1: fixed in 5.2.1-2.5+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
giflib5.2.2-1
  • every version up to 5.2.2-1+deb13u1: fixed in 5.2.2-1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
giflib5.2.2-1
  • every version up to 6.1.3-1: fixed in 6.1.3-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 4× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 149 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-03 14:25 UTCEPSS rescore
  3. 2026-10-01 19:49 UTCEPSS rescore
  4. 2026-09-30 15:03 UTCEPSS rescore
  5. 2026-09-28 13:51 UTCEPSS rescore
  6. 2026-09-26 15:58 UTCEPSS rescore
  7. 2026-09-26 00:26 UTCEPSS rescore
  8. 2026-09-20 20:15 UTCEPSS rescore
  9. 2026-09-20 20:15 UTCEPSS rescore
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 19:27 UTCEPSS rescore
  12. 2026-09-17 19:30 UTCEPSS rescore
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-13 16:47 UTCEPSS rescore
  16. 2026-09-12 15:01 UTCEPSS rescore
  17. 2026-09-11 14:52 UTCEPSS rescore
  18. 2026-09-10 09:34 UTCEPSS rescore
  19. 2026-09-08 22:00 UTCEPSS rescore
  20. 2026-09-07 16:01 UTCEPSS rescore
  21. 2026-09-06 13:47 UTCEPSS rescore
  22. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-04 05:06 UTCEPSS rescore
  24. 2026-09-02 14:11 UTCEPSS rescore
  25. 2026-09-01 13:53 UTCEPSS rescore
Show 75 more
  1. 2026-09-01 04:39 UTCEPSS rescore
  2. 2026-08-30 19:17 UTCEPSS rescore
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 14:46 UTCEPSS rescore
  7. 2026-08-25 13:48 UTCEPSS rescore
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-19 17:03 UTCEPSS rescore
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 11:15 UTCEG score recompute
  16. 2026-08-16 11:15 UTCVendor advisory
  17. 2026-08-16 11:15 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 20:15 UTCVendor advisory
  21. 2026-08-14 20:15 UTCGHSA enrichment
  22. 2026-08-14 07:23 UTCEG score recompute
  23. 2026-08-14 07:23 UTCVendor advisory
  24. 2026-08-14 07:23 UTCGHSA enrichment
  25. 2026-08-13 22:00 UTCEPSS rescore
  26. 2026-08-12 22:10 UTCEG score recompute
  27. 2026-08-12 22:10 UTCVendor advisory
  28. 2026-08-12 22:10 UTCGHSA enrichment
  29. 2026-08-12 13:50 UTCEPSS rescore
  30. 2026-08-11 21:30 UTCEG score recompute
  31. 2026-08-11 21:30 UTCVendor advisory
  32. 2026-08-11 21:30 UTCGHSA enrichment
  33. 2026-08-11 13:42 UTCEPSS rescore
  34. 2026-08-11 04:35 UTCEG score recompute
  35. 2026-08-11 04:35 UTCVendor advisory
  36. 2026-08-11 04:35 UTCGHSA enrichment
  37. 2026-08-11 00:00 UTCEPSS rescore
  38. 2026-08-10 08:41 UTCVendor advisory
  39. 2026-08-10 08:41 UTCGHSA enrichment
  40. 2026-08-09 19:49 UTCEG score recompute
  41. 2026-08-09 19:49 UTCVendor advisory
  42. 2026-08-09 19:49 UTCGHSA enrichment
  43. 2026-08-09 13:46 UTCEPSS rescore
  44. 2026-08-09 06:58 UTCEG score recompute
  45. 2026-08-09 06:58 UTCVendor advisory
  46. 2026-08-09 06:58 UTCGHSA enrichment
  47. 2026-08-08 16:37 UTCEPSS rescore
  48. 2026-08-08 06:22 UTCVendor advisory
  49. 2026-08-08 06:22 UTCGHSA enrichment
  50. 2026-08-07 17:30 UTCEG score recompute
  51. 2026-08-07 17:30 UTCVendor advisory
  52. 2026-08-07 17:30 UTCGHSA enrichment
  53. 2026-08-06 19:29 UTCEG score recompute
  54. 2026-08-06 19:29 UTCVendor advisory
  55. 2026-08-06 19:29 UTCGHSA enrichment
  56. 2026-08-06 13:46 UTCEPSS rescore
  57. 2026-08-06 01:37 UTCEG score recompute
  58. 2026-08-06 01:37 UTCVendor advisory
  59. 2026-08-06 01:37 UTCGHSA enrichment
  60. 2026-08-05 19:17 UTCEPSS rescore
  61. 2026-08-04 15:10 UTCEPSS rescore
  62. 2026-08-04 00:47 UTCEG score recompute
  63. 2026-08-04 00:47 UTCVendor advisory
  64. 2026-08-04 00:47 UTCGHSA enrichment
  65. 2026-08-03 10:36 UTCEPSS rescore
  66. 2026-08-02 16:40 UTCEG score recompute
  67. 2026-08-02 16:40 UTCVendor advisory
  68. 2026-08-02 16:40 UTCGHSA enrichment
  69. 2026-08-02 02:26 UTCEPSS rescore
  70. 2026-08-01 04:16 UTCEPSS rescore
  71. 2026-07-30 16:27 UTCEPSS rescore
  72. 2026-07-30 01:30 UTCEPSS rescore
  73. 2026-07-28 15:36 UTCEPSS rescore
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-26 14:54 UTCEPSS rescore

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

Frequently asked(5)

What is CVE-2026-26740?
CVE-2026-26740 is a high vulnerability published on March 18, 2026. Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the EGifGCBToExtension overwriting an existing Graphic Control Extension block without validating its allocated size.
When was CVE-2026-26740 disclosed?
CVE-2026-26740 was first published on March 18, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26740 actively exploited?
CVE-2026-26740 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (62nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-26740?
CVE-2026-26740 has a CVSS v3.1 base score of 8.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-26740?
A fix for CVE-2026-26740 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-26740 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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