CVE-2026-18536
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.
The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.
The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.
Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
7.5
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.
The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.
The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.
Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
- Record
CVE-2026-18536- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-319, CWE-353
- Updated
- 2026-11-02
EUVDEUVD-2026-51803
7.5
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.
The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.
The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.
Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
- Record
EUVD-2026-51803- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
NVD
7.5
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.
The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.
The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.
Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
- Record
CVE-2026-18536- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-319, CWE-353
- Updated
- 2026-11-02
OSV
7.5
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.
The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.
The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.
Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
- Record
CVE-2026-18536- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-319, CWE-353
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-18536
7.5
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP. The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP. The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string. Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
- Record
DEBIAN-CVE-2026-18536- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-18536
7.5
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP. The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP. The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string. Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
- Record
UBUNTU-CVE-2026-18536- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libdata-entropy-perlDebian:12 |
All versions, plus listed versions 0.007-40.007-4+deb12u10.008-1 |
None known |
libdata-entropy-perlDebian:13 |
All versions, plus listed versions 0.008-1 |
None known |
libdata-entropy-perlDebian:14 |
All versions, plus listed versions 0.008-1 |
None known |
libdata-entropy-perlUbuntu:16.04:LTS |
All versions, plus listed versions 0.007-3 |
None known |
libdata-entropy-perlUbuntu:18.04:LTS |
All versions, plus listed versions 0.007-3 |
None known |
libdata-entropy-perlUbuntu:20.04:LTS |
All versions, plus listed versions 0.007-3 |
None known |
libdata-entropy-perlUbuntu:22.04:LTS |
All versions, plus listed versions 0.007-3.1 |
None known |
libdata-entropy-perlUbuntu:24.04:LTS |
All versions, plus listed versions 0.007-4 |
None known |
libdata-entropy-perlUbuntu:26.10 |
All versions, plus listed versions 0.008-1 |
None known |
libdata-entropy-perlUbuntu:26.04:LTS |
All versions, plus listed versions 0.008-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-18536 is a high vulnerability (CVSS 7.5) in Rrwo Data::entropy, published August 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 10th percentile. No source names a fixed version.
References
github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv
metacpan.org/release/RRWO/Data-Entropy-0.010/changes
metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm
security.metacpan.org/docs/guides/random-data-for-security.html
openwall.com/lists/oss-security/2026/08/01/8
cpan.org/modules
Show 7 moreShow less
github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18536.json
nvd.nist.gov/vuln/detail/CVE-2026-18536
github.com/robrwo/Data-Entropy
security-tracker.debian.org/tracker/CVE-2026-18536
ubuntu.com/security/CVE-2026-18536
cve.org/CVERecord?id=CVE-2026-18536
lists.security.metacpan.org/cve-announce/msg/42317754