CVE-2026-48959

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.

fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.

Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip->new($zip, Name => $target) drives a per-byte read loop scaling with the entry's compressed size, up to the non-Zip64 4 GiB cap.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

Published

May 27, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jun 4, 2026
Patch available.
generic

oss-security - CVE-2026-48959: IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward

http://www.openwall.com/lists/oss-security/2026/05/27/2
generic

Changes - metacpan.org

https://metacpan.org/release/PMQS/IO-Compress-2.220/changes
generic
https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch

Vendor Advisories for CVE-2026-48959(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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuperl-modules-5.38 (5.38.2-3.2ubuntu0.4) @ noble2026-09-14ubuntu

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.

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
libio-compress-perl2.101-1 ... 2.223-1 (22 versions)
  • every version on: no fix on record
—
perl5.32.1-4 ... 5.44.0-1 (59 versions)
  • every version on: no fix on record
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
libio-compress-perl2.204-1
  • every version up to 2.204-1+deb12u1: fixed in 2.204-1+deb12u1
—
perl5.36.0-10 ... 5.44.0-1 (43 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
libio-compress-perl2.213-1
  • every version up to 2.213-1+deb13u1: fixed in 2.213-1+deb13u1
—
perl5.40.1-6
  • every version up to 5.40.1-6+deb13u1: fixed in 5.40.1-6+deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
libio-compress-perl2.213-1, 2.214-1, 2.217-1, 2.219-1, 2.219-2
  • every version up to 2.220-1: fixed in 2.220-1
—
perl5.40.1-6, 5.40.1-7
  • every version up to 5.40.1-8: fixed in 5.40.1-8
—

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 8× in last 7d / 26× 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.

Showing the most recent 100 of 292 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-03 19:51 UTCOSV refresh
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-28 13:51 UTCEPSS rescore
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-26 00:27 UTCEPSS rescore
  15. 2026-09-23 17:53 UTCEPSS rescore
  16. 2026-09-20 20:16 UTCEPSS rescore
  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-16 14:08 UTCEPSS rescore
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-14 09:34 UTCEG score recompute
  21. 2026-09-14 09:34 UTCVendor advisory
  22. 2026-09-14 09:34 UTCGHSA enrichment
  23. 2026-09-13 16:47 UTCEPSS rescore
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 01:23 UTCOSV refresh
Show 75 more
  1. 2026-09-10 09:35 UTCEPSS rescore
  2. 2026-09-08 22:01 UTCEPSS rescore
  3. 2026-09-07 16:01 UTCEPSS rescore
  4. 2026-09-06 13:47 UTCEPSS rescore
  5. 2026-09-04 05:06 UTCEPSS rescore
  6. 2026-09-02 14:12 UTCEPSS rescore
  7. 2026-09-01 13:54 UTCEPSS rescore
  8. 2026-09-01 04:40 UTCEPSS rescore
  9. 2026-08-30 19:17 UTCEPSS rescore
  10. 2026-08-30 01:22 UTCEPSS rescore
  11. 2026-08-28 21:41 UTCEPSS rescore
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-25 13:49 UTCEPSS rescore
  15. 2026-08-23 15:52 UTCEG score recompute
  16. 2026-08-23 15:52 UTCVendor advisory
  17. 2026-08-23 15:52 UTCGHSA enrichment
  18. 2026-08-23 00:19 UTCEPSS rescore
  19. 2026-08-21 23:49 UTCEPSS rescore
  20. 2026-08-21 21:13 UTCEG score recompute
  21. 2026-08-21 21:13 UTCGHSA enrichment
  22. 2026-08-20 22:55 UTCEPSS rescore
  23. 2026-08-20 17:55 UTCEG score recompute
  24. 2026-08-20 17:55 UTCVendor advisory
  25. 2026-08-20 17:55 UTCGHSA enrichment
  26. 2026-08-19 17:04 UTCEPSS rescore
  27. 2026-08-18 13:48 UTCEPSS rescore
  28. 2026-08-17 13:47 UTCEPSS rescore
  29. 2026-08-17 09:28 UTCVendor advisory
  30. 2026-08-17 09:28 UTCGHSA enrichment
  31. 2026-08-16 16:28 UTCEG score recompute
  32. 2026-08-16 16:28 UTCVendor advisory
  33. 2026-08-16 16:28 UTCGHSA enrichment
  34. 2026-08-16 14:56 UTCEPSS rescore
  35. 2026-08-16 03:00 UTCEG score recompute
  36. 2026-08-16 03:00 UTCVendor advisory
  37. 2026-08-16 03:00 UTCGHSA enrichment
  38. 2026-08-16 02:14 UTCEPSS rescore
  39. 2026-08-15 01:30 UTCEPSS rescore
  40. 2026-08-15 00:53 UTCGHSA enrichment
  41. 2026-08-14 13:16 UTCVendor advisory
  42. 2026-08-14 13:16 UTCGHSA enrichment
  43. 2026-08-14 01:39 UTCEG score recompute
  44. 2026-08-14 01:39 UTCVendor advisory
  45. 2026-08-14 01:39 UTCGHSA enrichment
  46. 2026-08-13 22:00 UTCEPSS rescore
  47. 2026-08-13 01:32 UTCGHSA enrichment
  48. 2026-08-12 13:55 UTCEG score recompute
  49. 2026-08-12 13:55 UTCVendor advisory
  50. 2026-08-12 13:55 UTCGHSA enrichment
  51. 2026-08-12 13:51 UTCEPSS rescore
  52. 2026-08-12 01:15 UTCEG score recompute
  53. 2026-08-12 01:15 UTCVendor advisory
  54. 2026-08-12 01:15 UTCGHSA enrichment
  55. 2026-08-11 13:38 UTCVendor advisory
  56. 2026-08-11 13:38 UTCGHSA enrichment
  57. 2026-08-11 00:18 UTCEG score recompute
  58. 2026-08-11 00:18 UTCVendor advisory
  59. 2026-08-11 00:18 UTCGHSA enrichment
  60. 2026-08-11 00:00 UTCEPSS rescore
  61. 2026-08-10 09:40 UTCGHSA enrichment
  62. 2026-08-09 22:03 UTCEG score recompute
  63. 2026-08-09 22:03 UTCGHSA enrichment
  64. 2026-08-09 13:46 UTCEPSS rescore
  65. 2026-08-09 10:26 UTCVendor advisory
  66. 2026-08-09 10:26 UTCGHSA enrichment
  67. 2026-08-08 22:49 UTCEG score recompute
  68. 2026-08-08 22:49 UTCVendor advisory
  69. 2026-08-08 22:49 UTCGHSA enrichment
  70. 2026-08-08 16:37 UTCEPSS rescore
  71. 2026-08-08 07:04 UTCGHSA enrichment
  72. 2026-08-07 19:27 UTCEG score recompute
  73. 2026-08-07 19:27 UTCGHSA enrichment
  74. 2026-08-07 07:50 UTCVendor advisory
  75. 2026-08-07 07:50 UTCGHSA enrichment

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-48959?
CVE-2026-48959 is a high vulnerability published on May 27, 2026. IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward. fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.…
When was CVE-2026-48959 disclosed?
CVE-2026-48959 was first published on May 27, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48959 actively exploited?
CVE-2026-48959 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48959?
CVE-2026-48959 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-48959?
A fix for CVE-2026-48959 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-48959 are linked in the Vendor Advisories panel on this page.

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