CVE-2026-34757

mediumpriority · track · 18EPSS 0.002 · 9 %ileDEEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.19% (9th) EPSS
CVSS 4.4 · medium
Is it mine?
57 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

5.1
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.4mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 2.5
v3.15.1mediumAV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU
v3.15.1mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU
v3.15.1mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.5 · impact 2.5
v3.14.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USCWE-416US
04

affected products (57)

Products and version ranges known to be affected.

showing 20 of 57
05

advisories (1)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-1023libpng: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2026-04-08csaf · cert_bundDE

    Ein lokaler Angreifer kann eine Schwachstelle in libpng ausnutzen, um Informationen offenzulegen.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundNVDCVE.orgMITRE
published 2026-04-09modified 2026-10-26
08

references (17)

External citations — patches, advisories, analysis.

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