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
Trending — 4 sources updated this week
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%CVSS: 7.5Exploit: None knownExposed: 0

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
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

May 27, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jun 4, 2026
No patch confirmed yet.
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 / EcosystemFixed in / 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 rangeFixed inDependents
libio-compress-perl2.101-1 ... 2.223-1 (22 versions)——
perl5.32.1-4 ... 5.44.0-1 (59 versions)——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
libio-compress-perl2.204-1 ... 2.223-1 (15 versions)——
perl5.36.0-10 ... 5.44.0-1 (43 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
libio-compress-perl2.213-1 ... 2.223-1 (9 versions)——
perl5.40.1-6 ... 5.44.0-1 (11 versions)——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
libio-compress-perl2.213-1, 2.214-1, 2.217-1, 2.219-1, 2.219-22.220-1—
perl5.40.1-6, 5.40.1-75.40.1-8—

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 7× in last 7d / 34× 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 276 total refreshes for this CVE.

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

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 68.8% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48959, 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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