A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.
CVE-2026-16517
LOWPre-NVD 2.92.9—Trending — Patch released this week
EchelonGraph scoreHIGH confidence
Score 2.9 from GitHub Security Advisory (severity: LOW) published 2026-07-22. a secondary CVSS source baseline 2.9; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
2.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 2.9Exploit: None knownExposed: 0
A fix is available — apply it.
- CVSS v3
- 2.9
- EG Score
- 2.9(high)
- EG Risk
- 13(Track)EG Risk 13/100SSVC: 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 computedSeverity29% × 45%Exploitation0% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 0%
- KEV
- Not listed
Published
July 21, 2026
Last Modified
July 22, 2026
References (3)
- secalert@redhathttps://access.redhat.com/errata/RHSA-2026:43818
- secalert@redhathttps://access.redhat.com/security/cve/CVE-2026-16517
- secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2505492
Vendor Advisories for CVE-2026-16517(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(1)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | libarchive-main-3.8.8-3.1.hum1 | 2026-07-22 | redhat |
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.
Data Freshness Timeline
(refreshed 22× 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.
- 2026-07-26 14:54 UTCEPSS rescore
- 2026-07-26 14:54 UTCEPSS rescore
- 2026-07-26 09:52 UTCEG score recompute
- 2026-07-26 09:52 UTCVendor advisory
- 2026-07-26 09:51 UTCGHSA enrichment
- 2026-07-25 14:17 UTCEPSS rescore
- 2026-07-25 14:17 UTCEPSS rescore
- 2026-07-24 14:17 UTCEPSS rescore
- 2026-07-23 14:18 UTCEPSS rescore
- 2026-07-23 14:18 UTCEPSS rescore
- 2026-07-23 03:06 UTCEG score recompute
- 2026-07-22 22:14 UTCEG score recompute
- 2026-07-22 22:14 UTCGHSA enrichment
- 2026-07-22 15:06 UTCEG score recompute
- 2026-07-22 15:06 UTCGHSA enrichment
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-22 13:39 UTCEG score recompute
- 2026-07-22 13:39 UTCGHSA enrichment
- 2026-07-22 01:44 UTCEG score recompute
- 2026-07-22 01:44 UTCGHSA enrichment
- 2026-07-21 23:10 UTCEG score recompute
- 2026-07-21 23:09 UTCMITRE cvelistV5first tracked
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat
- CVE-2001-0825EG 10.0HIGH
- CVE-2001-1009EG 10.0EPSS p93HIGH
- CVE-2001-0554EG 10.0EPSS p98HIGH
- CVE-2001-1162EG 10.0EPSS p96HIGH
- CVE-2001-0414EG 10.0EPSS p100HIGH
- CVE-2001-0191EG 10.0EPSS p92HIGH
- CVE-2001-0301EG 10.0EPSS p90HIGH
- CVE-2001-0197EG 10.0EPSS p96HIGH
- CVE-2001-0233EG 10.0EPSS p96HIGH
- CVE-2001-0010EG 10.0EPSS p98HIGH
Same CWE
10 shownCWE-190
Frequently asked(5)
What is CVE-2026-16517?
CVE-2026-16517 is a low vulnerability published on July 21, 2026. A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archivewritezipheader function in archivewritesetformatzip.c, when ZIP encryption is enabled and the entry file size is close to INT64MAX, the addition of the encryption overhead to the entry size overflows…
When was CVE-2026-16517 disclosed?
CVE-2026-16517 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16517 actively exploited?
CVE-2026-16517 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 99.8% of all scored CVEs.
What is the CVSS score of CVE-2026-16517?
CVE-2026-16517 has a CVSS v3 base score of 2.9 (NVD).
How do I remediate CVE-2026-16517?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16517, 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
Explore the affected products and dependency analysis for CVE-2026-16517
Is Your Infrastructure Affected by CVE-2026-16517?
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