CVE-2026-91088

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory (severity: LOW) published 2026-09-15. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability has been found in GPAC up to f1219cde. This issue affects the function gf_url_concatenate_ex of the file utils/url.c of the component URL Handler. The manipulation leads to heap-based buffer overflow. An attack has to be approached locally. Upgrading to version abi-16.23 is capable of addressing this issue. The identifier of the patch is afca1f1181668d85941d51ed1adf647807d5d975. It is advisable to upgrade the affected component.

CVSS v3
4.8
EG Score
4.8(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

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
Severity48% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GitHub - gpac/gpac: GPAC Ultramedia OSS for Video Streaming & Next-Gen Multimedia Transcoding, Packaging & Delivery · GitHub

https://github.com/gpac/gpac/
github_commit

commit afca1f118166 (gpac/gpac)

Fix landed in gpac/gpac commit afca1f118166 — awaiting tagged release

https://github.com/gpac/gpac/commit/afca1f1181668d85941d51ed1adf647807d5d975
generic

heap-buffer-overflow in `gf_url_concatenate_ex` during proto instantiation · Issue #3808 · gpac/gpac · GitHub

https://github.com/gpac/gpac/issues/3808

Vendor Advisories for CVE-2026-91088(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 19× 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. 2026-09-20 17:13 UTCGHSA enrichment
  2. 2026-09-19 16:50 UTCEG score recompute
  3. 2026-09-19 16:49 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 16:30 UTCEG score recompute
  6. 2026-09-18 16:30 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-17 16:10 UTCGHSA enrichment
  9. 2026-09-16 15:51 UTCEG score recompute
  10. 2026-09-16 15:50 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 15:31 UTCEG score recompute
  14. 2026-09-15 15:31 UTCGHSA enrichment
  15. 2026-09-15 14:52 UTCEG score recompute
  16. 2026-09-15 14:52 UTCGHSA enrichment
  17. 2026-09-15 07:32 UTCEG score recompute
  18. 2026-09-15 07:09 UTCEG score recompute
  19. 2026-09-15 07:08 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91088?
CVE-2026-91088 is a medium vulnerability published on September 15, 2026. A vulnerability has been found in GPAC up to f1219cde. This issue affects the function gfurlconcatenate_ex of the file utils/url.c of the component URL Handler. The manipulation leads to heap-based buffer overflow. An attack has to be approached locally. Upgrading to version abi-16.23 is capable of…
When was CVE-2026-91088 disclosed?
CVE-2026-91088 was first published in the National Vulnerability Database on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91088 actively exploited?
CVE-2026-91088 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 98.1% of all scored CVEs.
What is the CVSS score of CVE-2026-91088?
CVE-2026-91088 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-91088?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91088, 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.

Dependency Blast Radius

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