CVE-2026-88387

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

LibRaw 0.22.0 contains an incorrect numeric conversion vulnerability in LibRaw::parse_tiff_ifd() when processing TIFF tag 0x00fe (NewSubfileType). A specially crafted RAW, TIFF, or DNG file can supply an attacker-controlled NewSubfileType value outside the range of a signed int. The parser converts this value and narrows it to int without performing range validation. This out-of-range conversion triggers undefined behavior, resulting in process termination and denial of service.

CVSS v3
5.5
EG Score
5.5MEDIUMhigh confidence
EG Risk
41
EG Risk 41/100CISA SSVC

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
Severity55% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

September 29, 2026

Advisory Details (3)

Auto-updated Sep 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
github_commit

commit b41cbbd61951 (LibRaw/LibRaw)

Fix landed in LibRaw/LibRaw commit b41cbbd61951 — awaiting tagged release

https://github.com/LibRaw/LibRaw/commit/b41cbbd61951783e0440590dae55411a16185bdf
github_pr

Harden TIFF NewSubfileType parsing

Upstream fix in progress (PR #853 · LibRaw/LibRaw, state=closed)

https://github.com/LibRaw/LibRaw/pull/853
generic

[Bug]Out-of-range float-to-int cast for TIFF tag 0x00fe (NewSubfileType) in LibRaw::parse_tiff_ifd triggers UBSan float-cast-overflow SIGILL (CWE-681) · Issue #844 · LibRaw/LibRaw · GitHub

https://github.com/LibRaw/LibRaw/issues/844

Vendor Advisories for CVE-2026-88387(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libraw0.20.2-2.1 ... 0.22.1-1~exp2 (24 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libraw0.21.4-2 ... 0.22.1-1~exp2 (9 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libraw0.21.4-2 ... 0.22.1-1~exp2 (8 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 29× 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. 2026-10-05 01:54 UTCEG score recompute
  2. 2026-10-05 01:54 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 02:14 UTCEG score recompute
  5. 2026-10-04 02:14 UTCGHSA enrichment
  6. 2026-10-03 02:34 UTCEG score recompute
  7. 2026-10-03 02:34 UTCGHSA enrichment
  8. 2026-10-02 02:54 UTCEG score recompute
  9. 2026-10-02 02:54 UTCGHSA enrichment
  10. 2026-10-01 19:51 UTCEPSS rescore
  11. 2026-10-01 02:53 UTCEG score recompute
  12. 2026-10-01 02:53 UTCGHSA enrichment
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-30 03:13 UTCEG score recompute
  15. 2026-09-30 03:13 UTCGHSA enrichment
  16. 2026-09-29 03:32 UTCEG score recompute
  17. 2026-09-29 03:32 UTCGHSA enrichment
  18. 2026-09-29 02:56 UTCEG score recompute▲ 5.50
  19. 2026-09-29 02:56 UTCGHSA enrichment
  20. 2026-09-29 02:55 UTCMITRE cvelistV5CVSS v3 → 5.5 · severity → MEDIUM
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-28 02:55 UTCEG score recompute
  23. 2026-09-28 02:55 UTCGHSA enrichment
  24. 2026-09-27 13:48 UTCEPSS rescore
  25. 2026-09-26 15:59 UTCEPSS rescore
Show 4 more
  1. 2026-09-24 21:37 UTCGHSA enrichment
  2. 2026-09-24 21:22 UTCNVD update
  3. 2026-09-24 20:47 UTCEG score recompute
  4. 2026-09-24 20:47 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-88387?
CVE-2026-88387 is a medium vulnerability published on September 24, 2026. LibRaw 0.22.0 contains an incorrect numeric conversion vulnerability in LibRaw::parsetiffifd() when processing TIFF tag 0x00fe (NewSubfileType). A specially crafted RAW, TIFF, or DNG file can supply an attacker-controlled NewSubfileType value outside the range of a signed int. The parser converts…
When was CVE-2026-88387 disclosed?
CVE-2026-88387 was first published on September 24, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88387 actively exploited?
CVE-2026-88387 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88387?
CVE-2026-88387 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88387?
An upstream fix for CVE-2026-88387 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-88387 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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