CVE-2026-34757

MEDIUMNVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 99% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.1Exploit: NoneExposed: 0

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. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.

CVSS v3
5.1
EG Score
5.1(medium)
EPSS
9.4%
KEV
Not listed

Published

April 9, 2026

Last Modified

May 13, 2026

Advisory Details (6)

Auto-updated May 9, 2026
Patch available. Sources: github.
generic Patch Available

[SECURITY] [DLA 4573-1] libpng1.6 security update

https://lists.debian.org/debian-lts-announce/2026/05/msg00017.html
github Patch Available

Use-after-free in `png_set_PLTE`, `png_set_tRNS` and `png_set_hIST` leading to corrupted chunk data and potential heap information disclosure · Advisory · pnggroup/libpng · GitHub

https://github.com/pnggroup/libpng/security/advisories/GHSA-6fr7-g8h7-v645
generic

Use-After-Free in `png_set_tRNS` Caused by Getter/Setter Pointer Aliasing · Issue #837 · pnggroup/libpng · GitHub

https://github.com/pnggroup/libpng/issues/837
generic

Use-after-free in png_set_PLTE, png_set_tRNS, and png_set_hIST when called with getter-returned pointers · Issue #836 · pnggroup/libpng · GitHub

https://github.com/pnggroup/libpng/issues/836
generic

fix: Handle getter-to-setter aliasing in append-style chunk setters · pnggroup/libpng@55d20aa · GitHub

https://github.com/pnggroup/libpng/commit/55d20aaa322c9274491cda82c5cd4f99b48c6bcc
generic

fix: Handle self-referencing pointers in getter-to-setter aliasing · pnggroup/libpng@398cbe3 · GitHub

https://github.com/pnggroup/libpng/commit/398cbe3df03f4e11bb031e07f416dfdde3684e8a

Vendor Advisories for CVE-2026-34757(2)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibpng16-16t64 (1.6.50-1ubuntu0.5) @ questing2026-06-15ubuntu
redhatlibpng-main-1.6.57-0.1.hum12026-05-05redhat

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.

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 9× in last 7d / 42× 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.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-27 03:08 UTCEPSS rescore
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  18. 2026-06-15 17:49 UTCEPSS rescore
  19. 2026-06-15 05:04 UTCEG score recompute
  20. 2026-06-15 05:04 UTCVendor advisory
  21. 2026-06-14 23:18 UTCEPSS rescore
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  25. 2026-06-11 20:33 UTCEG score recompute
  26. 2026-06-11 20:33 UTCVendor advisory
  27. 2026-06-10 22:18 UTCEPSS rescore
  28. 2026-06-10 13:25 UTCEG score recompute
  29. 2026-06-10 13:25 UTCVendor advisory
  30. 2026-06-10 13:22 UTCEPSS rescore
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  32. 2026-06-09 13:06 UTCVendor advisory
  33. 2026-06-08 14:17 UTCEPSS rescore
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  35. 2026-06-08 08:59 UTCEG score recompute
  36. 2026-06-08 08:59 UTCVendor advisory
  37. 2026-06-07 15:25 UTCEPSS rescore
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  40. 2026-06-07 08:39 UTCEG score recompute
  41. 2026-06-07 08:39 UTCVendor advisory
  42. 2026-06-06 13:47 UTCEPSS rescore
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  67. 2026-05-23 00:08 UTCEG score recompute
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  71. 2026-05-20 18:07 UTCVendor advisory
  72. 2026-05-20 11:22 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34757?
CVE-2026-34757 is a medium vulnerability published on April 9, 2026. LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from pnggetPLTE, pnggettRNS, or pnggethIST back into the corresponding setter on the same…
When was CVE-2026-34757 disclosed?
CVE-2026-34757 was first published in the National Vulnerability Database on April 9, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34757 actively exploited?
CVE-2026-34757 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34757?
CVE-2026-34757 has a CVSS v3 base score of 5.1 (NVD).
How do I remediate CVE-2026-34757?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34757, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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